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Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa. Since the cuticle of these animals typically forms a largely inelastic exoskeleton, it is shed during growth and a new, larger covering is formed. [1] The remnants of the old, empty exoskeleton are called exuviae. [2]
Inclusion of the roundworms within the Ecdysozoa was initially contested [15] [34] [35] but since 2003, a broad consensus has formed supporting the Ecdysozoa [36] and in 2011 the Darwin–Wallace Medal was awarded to James Lake for the discovery of the New Animal Phylogeny consisting of the Ecdysozoa, the Lophotrochozoa, and the Deuterostomia. [37]
Microfossils dating from – just 3 million years after the end of the Cryogenian glaciations – may represent embryonic 'resting stages' in the life cycle of the earliest known animals. [54] An alternative proposal is that these structures represent adult stages of the multicellular organisms of this period. [ 55 ]
Reproduction and life cycle Asexual reproduction ... Ecdysozoa (Arthropods, etc.) Spiralia: ... When their cells divide after the 4-cell stage, descendants of these ...
[a] [20] All animals are motile [21] (able to spontaneously move their bodies) during at least part of their life cycle, but some animals, such as sponges, corals, mussels, and barnacles, later become sessile. The blastula is a stage in embryonic development that is unique to animals, allowing cells to be differentiated into specialised tissues ...
Pages in category "Ecdysozoa" The following 6 pages are in this category, out of 6 total. This list may not reflect recent changes. ...
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
The eukaryotic cell cycle consists of four distinct phases: G 1 phase, S phase (synthesis), G 2 phase (collectively known as interphase) and M phase (mitosis and cytokinesis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's nucleus divides, and cytokinesis, in which the cell's cytoplasm and cell membrane divides forming two daughter cells.